TY  - BOOK
AU  - Everitt, W N, 
AU  - 
TI  - Spectral theory and differential equations
T2  - Lecture Notes in Mathematics, No.0448
U1  - R  LNM.0448 
PY  - 1975///
CY  - Springer-Verlag, Berlin
KW  - Lecture Notes in Mathematics
ER  -